Apparatus for effecting the continuous concentration of sulfuric acid.



S. DREYFUS.

' APPARATUS FOR EFFECTING THE CONTINUOUS CONCENTRATION OF SULFURIC ACID.

APPLICATION FILED JAN. 10. 1911;

1,217,577. A r mmed Feb.27,1917.

g Unvc M20/ 73y ell/ 07.415340 SYLVAIN EREYFUS, F DENTON, NEAR MANCHESTER, LANCASTER, ENGLAND.

APEAZRATUS FOR EFEECTING THE CONTINUOUS CONCENTRATION OF SULEURIC ACID.

Specification of Letters Patent. Patented Feb. 27, 1911?.

Application filed January 10, 1917; Serial No. 141,724. v

To all whom z't may concern:

Be 1t it known that I, SYLVAIN DRnYrUs, a

7 subject ofthe King of- Great Britain and Ireland, and a. resident of Denton', near Man -che'ster, in the county of Lancaster, England, have invented certain new and useful- Improvements in Apparatus for Eifecting the Continuous Concentration of- Sulfuric Acid, of which the following is a specifica- 'tion. In the manufacture of certain explosives sulfuric acid of high, percentage is necessary and up to now most of this has been obtained by enriching H 168,Twadde1l '(92' to 93%) with oleum. The object 'of the present invention is to obtain a sulfuric acid of high percentage without the use of oleum, and w th simple apparatus made of 'cast' iron.

viz: (a) that 90 to'93% sulfuric acid does not 7 attack cast iron, and (b) that in the process .of., concentrating sulfuric acid the. higher percentage of the acid is always at the bottom of the apparatus. In combination with these, said principles, I also .take advantage of andadopt the further known principles,

. (c) that water is eliminated. from sulfuric;

acid only gradually, and ,(d) i that such gradual evaporation maybe obtained by letting the acid to be concentrated travel,

while heated, an extended distance, eitherthrough many vessels, as by the cascade, as in other known processes.

In carrymgout the invention, I employ apparatus made of cast'iron-and comprislng anouter pan and an inner pan or pans and also a cylinder or cylinders, -or,-i n place ofpans and cylinders, the said outer pan is fitted with internal divisions, the arrange- Ward, then-upward, then. downward again,

ment in either case being such that the acid has to take a circuitous up and down path before itreaches the oulet. ra n'gement is also such that the concentrated acid always flows from the bottom of the apparatus before being drawn of. .The apparatus is heated externally in any suitable manner. Within such apparatus I place, up

to the' level of the overflow, concentrated sulfuric acid of a strength which will not afl'ect the cast iron. The acid to be concentrated is then admitted to theapparatus,

ccording to the invention, I take advan- 7 ,tage of and adopt two .knownprinciples,

The said ar- 'ning ofi the concentrated the concentrated acidbeing simultaneously run off in corresponding quantities. The

weak acid will, of'course, be admitted at a rate suitable for the required concentration.

'.The resulting cfiect of-such' method or processoff concentration is that a sulfuric acid of high percentage, (95% and above) maybe obtained, and in a; continuous man- 'ner; A further'efict is that theacid can be obtained, using a cast-iron apparatus of comparatively simple construction and small s1'ze.-

Theaccompanyingdrawings illustrate, in cross-sectionalelevation, various examples of the improved apparatus.

The PP atus. illustrated, Figure 1 sists of a cast-iron pan a wherein is isitufloor of the pan .a. Depending into the pan 6," and'reaching almost down; to thebottom of the pan, is a cast-iron cylinder 0.; Closing the'upper end of the pan a fand cylinder 0' is any suitable form of cover, in which are in. let pipe d and vent pipefe. Upon' the exterior of the pan a is theoverflow pipe f. Below andgaround the apparatus *are the usual fire g and this passages It.

Instarting thel'pro'cess' the pan 6 is first ated a further and smallerfc'ast-iron pan Z Supportedby say cast-iron feet;-. b upon the fiowing through the apparatus the acid has an extended traverse, first flowing downpipe.

The

process can becarried on continuously by introducing .intothe cylinder 0 the weak acid'to-be concentrated and runsponding quantities. v j

Holes 0 are provided to allow theproducts of evaporation toreach the vent pipe 6-.

acid -in correcylinder is arranged between the tWo pans a and Z), instead of Within the pan 6,

In Fig. at, the apparatus therein shown comprises two inner pans b, b and three cylinders c, 0, 0, and the overflow pipe 7 is at the top of the apparatus.

In the apparatus shown in Fig. 5, the pan a is fitted with cast-iron cylinders 0, 0 only, certain of which depend from the cover or lid of the apparatus, While certain others rise from the floor of the apparatus, the depending cylinders alternating with the cylinders rising'from the floor. The overflow .copies of this patent may be obtained for pipe f is at the top of pipe f is arranged at the top of the apparatus. I

What I claim and desire to secure by Letters Patent is Apparatus for the continuous concentration of sulfuric acid to and upward,comprising a cast-iron vessel, means for heating said vessel, a plurality of cylindrical divisions in said vessel communicating with each other at the top and bottom alternately and forming a circuitous path'leading t0 the bottom of said vessel, means for introducing Weak acid to the interior of the innermost of said divisions, an outlet for the concentrated acid leading from the bottom of said vessel and means for venting the products of evaporation.

In Witness whereof I have hereuntd set In hand.

y SYLVAIN DREYFUS.

five cents each, by addressing the Commissioner of Patents, I Washington, D. G.- 

